Avatar CB115 vs B212

I have a 210 and am figuring out what would be best for some real thump and thunder. By emminence specs, the 15er should rival the 2 12inchers volume wise, but is that true in reality with 400 watts? I can live without deep lows: but the 210 is too bass light by itself.

Also CB15 is lighter and easier to carry. And I could get another later on and daisychain if really nessecary.